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Downgrade `@actions/cache` for now #4724

Job	Run time
Rust analysis (ubuntu-latest, nightly-latest)	1m 18s
Rust analysis (ubuntu-latest, linked)	1m 18s
Rust analysis (ubuntu-latest, stable-v2.22.1)	1m 19s
Rust analysis (ubuntu-latest, stable-v2.19.4)	1m 20s
Rust analysis (ubuntu-latest, default)	1m 21s
	6m 36s